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From: Ying Tang <ivytang0812@gmail.com>
Date: Mon, 6 Dec 2010 21:11:43 +0800
Message-ID: <AANLkTikJUw=etz7PRm_x-qt_d-b+4fyVdTFmFPOzK9Yd@mail.gmail.com>
Subject: Re: 0.7.0beta3 Cassandra frequently log GC for ConcurrentMarkSweep
To: user@cassandra.apache.org
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And after checking node who gc concurrentMarkSweep frequently ,it's OC(Current
old space capacity (KB)) is 1006016.0 ,it's OU(Old space utilization (KB).)
is also 1006016.0  ,almost all memory.
Dose this situation imply this heap size is set too low?

On Mon, Dec 6, 2010 at 8:07 PM, Ying Tang <ivytang0812@gmail.com> wrote:

> I hava a two node , running cassandra ,both's memory is 4G.
> First i set heap size to 2G ,both run normal .
> The i set heap size to 1G ,  the client who insert data to and read data
> from cassandra began throw Read\Write Unavailable Exception . And one
> cassandra node began  logging  GC for ConcurrentMarkSweep frequently  ,every
> ConcurrentMarkSweep 's time is over 5000ms.
> How this happen ? Why frequently ConcurrentMarkSweep GC ,not ParNew GC?
>
> --
> Best regards,
> Ivy Tang
>
>
>
>


-- 
Best regards,

Ivy Tang

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<div>And after checking node who=A0gc=A0concurrentMarkSweep frequently ,it&=
#39;s OC(<span style=3D"WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; =
BORDER-COLLAPSE: separate; FONT: medium Simsun; WHITE-SPACE: normal; ORPHAN=
S: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit=
-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -web=
kit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webk=
it-text-stroke-width: 0px" class=3D"Apple-style-span"><span style=3D"FONT-F=
AMILY: Arial, Helvetica, sans-serif; FONT-SIZE: 13px; -webkit-border-horizo=
ntal-spacing: 2px; -webkit-border-vertical-spacing: 2px" class=3D"Apple-sty=
le-span">Current old space capacity (KB)</span></span>) is 1006016.0 ,it=
9;s OU(<span style=3D"WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; BO=
RDER-COLLAPSE: separate; FONT: medium Simsun; WHITE-SPACE: normal; ORPHANS:=
 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-b=
order-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webki=
t-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit=
-text-stroke-width: 0px" class=3D"Apple-style-span"><span style=3D"FONT-FAM=
ILY: Arial, Helvetica, sans-serif; FONT-SIZE: 13px; -webkit-border-horizont=
al-spacing: 2px; -webkit-border-vertical-spacing: 2px" class=3D"Apple-style=
-span">Old space utilization (KB).</span></span>) is also 1006016.0=A0 ,alm=
ost all memory.</div>


<div>Dose this situation imply this heap size is set too low?</div>
<div>=A0</div>
<div class=3D"gmail_quote">On Mon, Dec 6, 2010 at 8:07 PM, Ying Tang <span =
dir=3D"ltr">&lt;<a href=3D"mailto:ivytang0812@gmail.com">ivytang0812@gmail.=
com</a>&gt;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote">
<div>I hava a two node , running cassandra ,both&#39;s memory is 4G.</div>
<div>First i set heap size to 2G ,both run normal .</div>
<div>The i set heap size to 1G ,=A0=A0the client who insert data to and rea=
d data from cassandra began throw Read\Write Unavailable Exception . And on=
e cassandra node began=A0 logging =A0GC for ConcurrentMarkSweep frequently=
=A0 ,every ConcurrentMarkSweep &#39;s time is over 5000ms. </div>


<div>How this happen ? Why frequently ConcurrentMarkSweep GC ,not ParNew GC=
?</div>
<div>=A0</div><font color=3D"#888888">
<div>-- <br></div>
<div>Best regards,<br></div>
<div>Ivy Tang</div>
<div><br></div>
<div><br></div><br></font></blockquote></div><br><br clear=3D"all"><br>-- <=
br>
<div>Best regards,</div>
<div><br></div>
<div>Ivy Tang</div>
<div><br></div>
<div><br></div><br>

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